BPK 201 Final UPDATED Actual Exam Questions and CORRECT Answers
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Course
BPK 201
Institution
BPK 201
BPK 201 Final UPDATED Actual Exam
Questions and CORRECT Answers
how does an accelerometer work? - CORRECT ANSWER- There is a spring inside a box
attached to a mass and we measure how much the spring stretches. since we know the
stiffness of the spring and the mass of the object, we can deter...
BPK 201 Final UPDATED Actual Exam
Questions and CORRECT Answers
how does an accelerometer work? - CORRECT ANSWER✔✔- There is a spring inside a box
attached to a mass and we measure how much the spring stretches. since we know the
stiffness of the spring and the mass of the object, we can determine its acceleration
What is a central challenge of wearable devices ie. fitbit - CORRECT ANSWER✔✔-
estimating what activity the person is engaged in, for how long and how intensely. Different
activities have different average accelerations, and different acceleration variabilities, along
different axes. Using training data to learn the relationships between accelerations and
activites, we can classify acceleration data into groups to differentiate between activities
What are some limitations of adding electromyography (EMG) technology to wearable
devices? - CORRECT ANSWER✔✔- Due to power and cost limitations, current watches
sample EMG signals at lower frequency than clinics would.
What are photoplethysmophography (PPG) sensors - CORRECT ANSWER✔✔- they are
LED light sensors used to measure heart rate:
LED light flashes against skin to illuminate capillaries in body and detect changes in blood
volume. When the light refracts off the flowing blood, the photodetector in the wearable tech
captures this info. The light data is processed with algorithms to produce reasonable Heart
rate readings. This is how HR can be displayed on apple watches.
how can watches measure HRV? - CORRECT ANSWER✔✔- they use
photoplethysmography (PPG) light sensors to measure the RR intervals (time between beats
in milliseconds)
what are some assumptions in using submaximal exercise heart rate to predict VO2max? -
CORRECT ANSWER✔✔- 1. linear relationship between heart rate and oxygen uptake
2. similar maximum heart rate for all subjects
3. when VO2 is predicted from work rate, a fixed mechanical efficiency is assumed
4. there is day to day variation in heart rate
stance begins and ends with - CORRECT ANSWER✔✔- periods of double support
"compass gait" - CORRECT ANSWER✔✔- refers to the trajectory of the COG if the length
of the pendulum remained constant throughout stance.
-very energy demanding as with each step the COG would rise 10cm
-creates abrupt arc collisions
-high forces required to re-direct COG velocity during heel strike
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